Features and Specifications:Extremely smooth in operation with a multi-facetted adjustment nut to get the exact tension required by the operatorFully adjustable with no tools required, can be adjusted to fit rails not machined to mil-spec tolerancesPrecision machined for optimum return to zero performance and reliabilityHard coat anodized 6061 aluminumPatented QD lever by Elite DefenseWorks with scopes with up to a 56mm objectiveWeight: 7.8 ozOverall Lenth: 5.100 inWidth of rings: .85 inDistance between rings: 3.400 inDistance - top of rail to center line of ring 1.50 in